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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: May 2003 Posts: 21 Junior Member | | Junior Member Joined: May 2003 Posts: 21 | Am going to restart my 230 after a one year restoration. Noticed that the water jacket has a fair amount of surface rust in it.
Have a new radiator core and am wondering if I should do some sort of flush or should I be worried about clogging the radiator??
Thanks | | | | | Joined: Mar 2002 Posts: 990 Member | | Member Joined: Mar 2002 Posts: 990 | you'd need the system put together to fill it with water and anti-rust goo, but you could push some water through it without a thermostat from the top to knock off any loose stuff. | | | 
#4023 03/23/2004 11:19 PM | Joined: Jul 2001 Posts: 20 Member | | Member Joined: Jul 2001 Posts: 20 | Install your new radiator, then run your top radiator hose into a five-gallon bucket. Connect your bottom hose to the radiator. Fill your radiator with water and fire up the engine. When the thermostat opens, hot water will rapidly fill the bucket (keep feeding new water into the radiator). I'd recommend having two buckets, so you can empty one while the other is filling. When the water runs clean, shut off the engine and connect your hose to the radiator. Drain the radiator dry, and then fill it with coolant. You can adjust the mix over a period of a couple of days- draining from the radiator so you can add more coolant, if necessary.
Don't let the critters get to the old coolant, they will drink it!
1954 Chevy 3100
454, T-400, GM 14-Bolt Disc brake
Monte Carlo Front Clip
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